LA Cartridge Calculation — NDEB AFK MCQ

Correct answer: C — 34 mg

A 2% lidocaine solution contains 20 mg/mL (2 g per 100 mL = 20 mg/mL). In a standard 1.7 mL dental cartridge: 20 mg/mL × 1.7 mL = 34 mg of lidocaine. For 1:100,000 epinephrine: each cartridge contains 0.017 mg (17 μg) of epinephrine. These calculations are essential for determining the maximum number of cartridges that can be safely administered based on the patient's weight.

Reference: Malamed – Handbook of Local Anesthesia, 7th ed., 2020